:root {
    --bg: #0e0c0b;
    --bg2: #1b1612;
    --bg3: #26201a;
    --bg4: #2d241d;
    --gold: #c97335;
    --gold2: #ec9a5c;
    --gold-dim: #6b3d1e;
    --white: #f6eddc;
    --white-dim: #a3978a;
    --white-muted: #a3978a;
    --red: #c84040;
    --green: #4a8c5c;
    --blue: #3a6888;
    --border: #3a2f28;
    --border2: #5a4a3f;
    --tag-bg: #1f1a15;
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }

  html { scroll-behavior: smooth; }

  body {
    background: var(--bg);
    color: var(--white);
    font-family: 'Barlow', sans-serif;
    font-weight: 300;
    overflow-x: hidden;
  }

  /* ─── HERO ─── */
  .hero {
    background: var(--bg);
    border-bottom: 1px solid var(--border2);
    padding: 56px 64px 52px;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0; right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(ellipse at 80% 40%, rgba(200,137,42,0.07) 0%, transparent 65%);
    pointer-events: none;
  }

  .hero-eyebrow {
    font-family: 'Space Mono', monospace;
    font-size: 11px;
    color: var(--gold);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 18px;
  }

  .hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
  }

  .hero-title {
    font-family: 'Bebas Neue', sans-serif;
    font-size: clamp(72px, 9vw, 120px);
    line-height: 0.88;
    letter-spacing: 0.02em;
  }

  .hero-title .line1 { color: var(--white); display: block; }
  .hero-title .line2 { color: var(--gold); display: block; }
  .hero-title .line3 { color: var(--white); display: block; }

  .hero-desc {
    font-size: 15px;
    line-height: 1.75;
    color: var(--white-dim);
    max-width: 460px;
    margin-bottom: 36px;
  }

  .hero-stats {
    display: flex;
    gap: 40px;
  }

  .home-link {
    position: absolute;
    top: 24px;
    right: 24px;
    font-family: 'Space Mono', monospace;
    font-size: 10px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--white);
    text-decoration: none;
    border: 1px solid var(--border2);
    padding: 10px 14px;
    background: rgba(14, 12, 11, 0.72);
    transition: border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
  }

  .home-link:hover {
    color: var(--gold2);
    border-color: var(--gold2);
    transform: translateY(-1px);
  }

  .stat-val {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 52px;
    color: var(--gold);
    line-height: 1;
    display: block;
  }

  .stat-label {
    font-family: 'Space Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.18em;
    color: var(--white-muted);
    text-transform: uppercase;
    display: block;
    margin-top: 4px;
  }

  /* ─── SEARCH BAR ─── */
  .search-bar-wrap {
    background: var(--bg2);
    border-bottom: 1px solid var(--border2);
    padding: 0 64px;
    display: flex;
    align-items: center;
    gap: 20px;
    position: sticky;
    top: 0;
    z-index: 100;
    height: 54px;
  }

  .search-icon {
    color: var(--white-muted);
    font-size: 16px;
    flex-shrink: 0;
  }

  #search-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--white);
    font-family: 'Barlow', sans-serif;
    font-size: 14px;
    font-weight: 300;
    caret-color: var(--gold);
  }

  #search-input::placeholder {
    color: var(--white-muted);
  }

  .search-pills {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
  }

  .pill {
    font-family: 'Space Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 5px 12px;
    border-radius: 20px;
    border: 1px solid var(--border2);
    color: var(--white-muted);
    cursor: pointer;
    transition: all 0.2s;
    background: none;
  }

  .pill.active, .pill:hover {
    background: var(--gold);
    color: var(--bg);
    border-color: var(--gold);
  }

  .search-hint {
    font-family: 'Space Mono', monospace;
    font-size: 10px;
    color: var(--white-muted);
    flex-shrink: 0;
  }

  /* ─── LAYOUT ─── */
  .layout {
    display: grid;
    grid-template-columns: 220px 1fr;
    min-height: calc(100vh - 200px);
  }

  /* ─── SIDEBAR ─── */
  .sidebar {
    background: var(--bg2);
    border-right: 1px solid var(--border);
    padding: 32px 0;
    position: sticky;
    top: 54px;
    height: calc(100vh - 54px);
    overflow-y: auto;
  }

  .sidebar::-webkit-scrollbar { width: 3px; }
  .sidebar::-webkit-scrollbar-track { background: transparent; }
  .sidebar::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

  .sidebar-label {
    font-family: 'Space Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.2em;
    color: var(--white-muted);
    text-transform: uppercase;
    padding: 0 24px;
    margin-bottom: 12px;
  }

  .nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 24px;
    cursor: pointer;
    border-left: 2px solid transparent;
    transition: all 0.15s;
    text-decoration: none;
  }

  .nav-item:hover {
    background: var(--bg3);
    border-left-color: var(--gold-dim);
  }

  .nav-item.active {
    background: var(--bg3);
    border-left-color: var(--gold);
  }

  .nav-num {
    font-family: 'Space Mono', monospace;
    font-size: 10px;
    color: var(--gold-dim);
    width: 20px;
    flex-shrink: 0;
  }

  .nav-item.active .nav-num { color: var(--gold); }

  .nav-text {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 13px;
    font-weight: 600;
    color: var(--white-dim);
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }

  .nav-item.active .nav-text { color: var(--white); }

  /* ─── CONTENT ─── */
  .content {
    padding: 0;
  }

  /* ─── CATEGORY SECTION ─── */
  .category-section {
    border-bottom: 1px solid var(--border);
  }

  .category-header {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 0;
    min-height: 180px;
    border-bottom: 1px solid var(--border2);
  }

  .category-title-col {
    background: var(--bg3);
    padding: 40px 40px;
    border-right: 1px solid var(--border2);
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .cat-eyebrow {
    font-family: 'Space Mono', monospace;
    font-size: 10px;
    color: var(--gold-dim);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    margin-bottom: 10px;
  }

  .cat-title {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 46px;
    line-height: 0.9;
    color: var(--white);
    letter-spacing: 0.03em;
  }

  .cat-title span { color: var(--gold); display: block; }

  .category-desc-col {
    padding: 40px 48px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .cat-desc {
    font-size: 14px;
    line-height: 1.75;
    color: var(--white-dim);
    max-width: 640px;
  }

  /* ─── TERM GRID ─── */
  .term-grid {
    padding: 32px 40px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1px;
    background: var(--border);
  }

  .term-card {
    background: var(--bg);
    padding: 28px 32px;
    transition: background 0.15s;
    border: none;
  }

  .term-card:hover {
    background: var(--bg3);
  }

  .term-card.hidden { display: none; }

  .term-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
  }

  .term-abbr {
    font-family: 'Space Mono', monospace;
    font-size: 9px;
    letter-spacing: 0.12em;
    color: var(--gold);
    background: rgba(200,137,42,0.1);
    border: 1px solid rgba(200,137,42,0.2);
    padding: 3px 8px;
    border-radius: 2px;
    text-transform: uppercase;
    flex-shrink: 0;
    margin-top: 2px;
  }

  .term-name {
    font-family: 'Barlow Condensed', sans-serif;
    font-size: 20px;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 0.03em;
    line-height: 1.1;
  }

  .term-def {
    font-size: 13.5px;
    line-height: 1.7;
    color: var(--white-dim);
    margin-bottom: 14px;
  }

  .term-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }

  .tag {
    font-family: 'Space Mono', monospace;
    font-size: 8px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 3px 8px;
    border-radius: 2px;
    border: 1px solid;
  }

  .tag-arch { color: #7aaed4; border-color: rgba(122,174,212,0.25); background: rgba(122,174,212,0.06); }
  .tag-mep  { color: #7ac49a; border-color: rgba(122,196,154,0.25); background: rgba(122,196,154,0.06); }
  .tag-pm   { color: #c8a87a; border-color: rgba(200,168,122,0.25); background: rgba(200,168,122,0.06); }
  .tag-cost { color: #c4706a; border-color: rgba(196,112,106,0.25); background: rgba(196,112,106,0.06); }
  .tag-tech { color: #a87ac8; border-color: rgba(168,122,200,0.25); background: rgba(168,122,200,0.06); }
  .tag-legal { color: #c8c47a; border-color: rgba(200,196,122,0.25); background: rgba(200,196,122,0.06); }
  .tag-field { color: #c8a07a; border-color: rgba(200,160,122,0.25); background: rgba(200,160,122,0.06); }
  .tag-struct { color: #d4a0a0; border-color: rgba(212,160,160,0.25); background: rgba(212,160,160,0.06); }

  /* ─── METRIC BOX ─── */
  .metric-row {
    display: flex;
    gap: 10px;
    margin-top: 14px;
  }

  .metric-box {
    border: 1px solid var(--border2);
    background: var(--bg2);
    padding: 8px 14px;
    border-radius: 2px;
    text-align: center;
    min-width: 80px;
  }

  .metric-box .sys {
    font-family: 'Space Mono', monospace;
    font-size: 8px;
    color: var(--white-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: 4px;
  }

  .metric-box .val {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 20px;
    color: var(--gold2);
    display: block;
    line-height: 1;
  }

  .metric-box .sub {
    font-family: 'Space Mono', monospace;
    font-size: 8px;
    color: var(--white-muted);
    letter-spacing: 0.06em;
    display: block;
    margin-top: 3px;
  }

  /* ─── NO RESULTS ─── */
  .no-results {
    display: none;
    padding: 80px;
    text-align: center;
  }

  .no-results.show { display: block; }

  .no-results-title {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 48px;
    color: var(--white-muted);
    margin-bottom: 12px;
  }

  .no-results-sub {
    font-family: 'Space Mono', monospace;
    font-size: 11px;
    color: var(--white-muted);
    letter-spacing: 0.1em;
  }

  /* ─── FOOTER ─── */
  footer {
    background: var(--bg2);
    border-top: 1px solid var(--border2);
    padding: 40px 64px;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  footer .foot-logo {
    font-family: 'Bebas Neue', sans-serif;
    font-size: 28px;
    color: var(--gold);
    letter-spacing: 0.05em;
  }

  footer .foot-note {
    font-family: 'Space Mono', monospace;
    font-size: 10px;
    color: var(--white-muted);
    letter-spacing: 0.1em;
  }

  /* ─── SCROLLBAR ─── */
  ::-webkit-scrollbar { width: 4px; height: 4px; }
  ::-webkit-scrollbar-track { background: var(--bg); }
  ::-webkit-scrollbar-thumb { background: var(--border2); }

  /* ─── SEARCH HIGHLIGHT ─── */
  mark {
    background: rgba(200,137,42,0.3);
    color: var(--gold2);
    border-radius: 2px;
    padding: 0 1px;
  }

  @media (max-width: 900px) {
    .layout { grid-template-columns: 1fr; }
    .sidebar { display: none; }
    .hero-grid { grid-template-columns: 1fr; }
    .category-header { grid-template-columns: 1fr; }
    .hero { padding: 40px 24px; }
    .home-link {
      top: 18px;
      right: 18px;
    }
    .search-bar-wrap { padding: 0 24px; }
    .term-grid { padding: 16px; }
    footer { flex-direction: column; gap: 16px; text-align: center; padding: 32px 24px; }
  }